Analytic self-force calculations in the post-Newtonian regime: eccentric orbits on a Schwarzschild background

Abstract

We present a method for solving the first-order field equations in a post-Newtonian (PN) expansion. Our calculations generalize work of Bini and Damour and subsequently Kavanagh et al., to consider eccentric orbits on a Schwarzschild background. We derive expressions for the retarded metric perturbation at the location of the particle for all $\ell$-modes. We find that, despite first appearances, the Regge-Wheeler gauge metric perturbation is $C^0$ at the particle for all $\ell$. As a first use of our solutions, we compute the gauge-invariant quantity $⟨U⟩$ through 4PN while simultaneously expanding in eccentricity through $e^{10}$. By anticipating the $e\to 1$ singular behavior at each PN order, we greatly improve the accuracy of our results for large $e$. We use $⟨U⟩$ to find 4PN contributions to the effective one body potential $\hat{Q}$ through $e^{10}$ and at linear order in the mass-ratio.

20 pages, 2 figures, Updated with minor changes, mostly to references

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